================================================================== BUG: KASAN: slab-use-after-free in txEnd+0x545/0x5a0 fs/jfs/jfs_txnmgr.c:506 Read of size 8 at addr ffff88805c67b430 by task jfsCommit/137 CPU: 3 PID: 137 Comm: jfsCommit Not tainted 6.9.0-rc1-syzkaller-00061-g8d025e2092e2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 txEnd+0x545/0x5a0 fs/jfs/jfs_txnmgr.c:506 txLazyCommit fs/jfs/jfs_txnmgr.c:2684 [inline] jfs_lazycommit+0x77b/0xb20 fs/jfs/jfs_txnmgr.c:2733 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 5669: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] jfs_fill_super+0xe5/0xd20 fs/jfs/super.c:495 mount_bdev+0x1e3/0x2d0 fs/super.c:1676 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1797 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x6e1/0x1f10 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 Freed by task 5213: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x129/0x390 mm/slub.c:4390 generic_shutdown_super+0x159/0x3d0 fs/super.c:641 kill_block_super+0x3b/0x90 fs/super.c:1693 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x275/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x8a/0x120 arch/x86/entry/common.c:324 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346 entry_SYSENTER_compat_after_hwframe+0x7a/0x84 The buggy address belongs to the object at ffff88805c67b400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 48 bytes inside of freed 256-byte region [ffff88805c67b400, ffff88805c67b500) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c67a head: order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff80000000840(slab|head|node=1|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 04fff80000000840 ffff888014c42b40 ffffea00016d1c80 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 head: 04fff80000000840 ffff888014c42b40 ffffea00016d1c80 dead000000000002 head: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 head: 04fff80000000001 ffffea0001719e81 ffffea0001719ec8 00000000ffffffff head: 0000000200000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5212, tgid 5212 (syz-executor.2), ts 47497789719, free_ts 47438902666 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x670/0x16d0 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0x3b4/0x440 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] kzalloc include/linux/slab.h:749 [inline] new_dir fs/proc/proc_sysctl.c:956 [inline] get_subdir fs/proc/proc_sysctl.c:1000 [inline] sysctl_mkdir_p fs/proc/proc_sysctl.c:1295 [inline] __register_sysctl_table+0xda8/0x16f0 fs/proc/proc_sysctl.c:1376 mpls_dev_sysctl_register+0x1eb/0x330 net/mpls/af_mpls.c:1422 mpls_add_dev net/mpls/af_mpls.c:1478 [inline] mpls_dev_notify+0x498/0xa10 net/mpls/af_mpls.c:1618 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1950 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] register_netdevice+0x157d/0x1c40 net/core/dev.c:10310 ipvlan_link_new+0x354/0xbf0 drivers/net/ipvlan/ipvlan_main.c:588 rtnl_newlink_create net/core/rtnetlink.c:3494 [inline] __rtnl_newlink+0x119c/0x1960 net/core/rtnetlink.c:3714 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3727 page last free pid 5213 tgid 5213 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 __put_partials+0x14c/0x170 mm/slub.c:2906 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3852 kmem_cache_zalloc include/linux/slab.h:739 [inline] __kernfs_new_node+0xd3/0x890 fs/kernfs/dir.c:624 kernfs_new_node+0x186/0x240 fs/kernfs/dir.c:700 __kernfs_create_file+0x53/0x350 fs/kernfs/file.c:1027 sysfs_add_file_mode_ns+0x1ff/0x3b0 fs/sysfs/file.c:307 create_files fs/sysfs/group.c:76 [inline] internal_create_group+0x565/0xe50 fs/sysfs/group.c:180 internal_create_groups+0x9d/0x150 fs/sysfs/group.c:220 device_add_groups drivers/base/core.c:2807 [inline] device_add_attrs drivers/base/core.c:2927 [inline] device_add+0xf70/0x1ab0 drivers/base/core.c:3659 netdev_register_kobject+0x187/0x3f0 net/core/net-sysfs.c:2136 register_netdevice+0x12c8/0x1c40 net/core/dev.c:10277 Memory state around the buggy address: ffff88805c67b300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805c67b380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805c67b400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805c67b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805c67b500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================